// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/render_view_impl.h"

#include "content/public/common/renderer_preferences.h"
#include "third_party/WebKit/public/web/linux/WebFontRendering.h"
#include "third_party/skia/include/core/SkFontLCDConfig.h"
#include "ui/gfx/font_render_params.h"

using blink::WebFontRendering;

namespace content {

namespace {

    const int kMaxDefaultFontSize = 999;

    SkPaint::Hinting RendererPreferencesToSkiaHinting(
        const RendererPreferences& prefs)
    {
        if (!prefs.should_antialias_text) {
            // When anti-aliasing is off, GTK maps all non-zero hinting settings to
            // 'Normal' hinting so we do the same. Otherwise, folks who have 'Slight'
            // hinting selected will see readable text in everything expect Chromium.
            switch (prefs.hinting) {
            case gfx::FontRenderParams::HINTING_NONE:
                return SkPaint::kNo_Hinting;
            case gfx::FontRenderParams::HINTING_SLIGHT:
            case gfx::FontRenderParams::HINTING_MEDIUM:
            case gfx::FontRenderParams::HINTING_FULL:
                return SkPaint::kNormal_Hinting;
            default:
                NOTREACHED();
                return SkPaint::kNormal_Hinting;
            }
        }

        switch (prefs.hinting) {
        case gfx::FontRenderParams::HINTING_NONE:
            return SkPaint::kNo_Hinting;
        case gfx::FontRenderParams::HINTING_SLIGHT:
            return SkPaint::kSlight_Hinting;
        case gfx::FontRenderParams::HINTING_MEDIUM:
            return SkPaint::kNormal_Hinting;
        case gfx::FontRenderParams::HINTING_FULL:
            return SkPaint::kFull_Hinting;
        default:
            NOTREACHED();
            return SkPaint::kNormal_Hinting;
        }
    }

} // namespace

void RenderViewImpl::UpdateFontRenderingFromRendererPrefs()
{
    const RendererPreferences& prefs = renderer_preferences_;
    WebFontRendering::setHinting(RendererPreferencesToSkiaHinting(prefs));
    WebFontRendering::setAutoHint(prefs.use_autohinter);
    WebFontRendering::setUseBitmaps(prefs.use_bitmaps);
    SkFontLCDConfig::SetSubpixelOrder(
        gfx::FontRenderParams::SubpixelRenderingToSkiaLCDOrder(
            prefs.subpixel_rendering));
    SkFontLCDConfig::SetSubpixelOrientation(
        gfx::FontRenderParams::SubpixelRenderingToSkiaLCDOrientation(
            prefs.subpixel_rendering));
    WebFontRendering::setAntiAlias(prefs.should_antialias_text);
    WebFontRendering::setSubpixelRendering(
        prefs.subpixel_rendering != gfx::FontRenderParams::SUBPIXEL_RENDERING_NONE);
    WebFontRendering::setSubpixelPositioning(prefs.use_subpixel_positioning);
    if (prefs.default_font_size > 0 && prefs.default_font_size <= kMaxDefaultFontSize) {
        WebFontRendering::setDefaultFontSize(prefs.default_font_size);
    }
#if !defined(OS_ANDROID)
    if (!prefs.system_font_family_name.empty()) {
        WebFontRendering::setSystemFontFamily(
            blink::WebString::fromUTF8(prefs.system_font_family_name));
    }
#endif
}

} // namespace content
